Update email.rst

[mikaelz]

Use name defined in the controller.

[javiereguiluz]

@mikaelz thanks for your contribution. However, in this case, I'm not sure about the proposed changes. It seems like You did it! You registered! is the heading of this email, so there is no need to add a new one before it.

[mikaelz]

IN the controller there is name variable defined and not used in the view.
It would be a good example how to pass variable from controller to view.

[xabbuh]

As this cookbook article focuses on sending e-mails, I would rather not pass the name variable to the template.

[wouterj]

Hi @mikaelz!

I agree with you, if we show how to pass a variable, we should use it in the template as well. I think showing that you can pass variables to a template is quite important detail for some people.

I also agree with @javiereguiluz, that the h3 is the title of the email. That's why I slightly tweaked the template to use the variable below the h3 after merging your PR in c53d20f.

Thanks!